高周波誘導結合プラズマ発光分光分析法による鋼中希土類元素の定量

概要

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Determination of each rare earth element (R.E.) in R.E. mixture was difficult by chemical method, because chemical characters of R.E. are very close to each other. The application of ICP-AES method was investigated for the analysis of R.E. in steel. Analysis elements were La, Ce, Pr and Nd in mischmetal. They were separated as fluoride precipitates from coexistent elements and recovery of R.E. was improved with Y coprecipitant within trace range. Emission intensity was regulated by the amount of H2SO4 to dissolve precipitates. It was corrected with Co as internal standard. Analytical line was selected to lessen spectral interference of each R.E., and accuracy was improved through correction of spectral interference. Precision and accuracy were about 2% and 3.5% on C.V. for the method.
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